Inclined screen.



L. G. ROWAND.

INCLINED SCREEN. APPLicATIoN FILED MAR. 23. 1918.

1,294,309. Y Patented Feb. 11, 1919.

` 3 SHEETS-s115511.

IN VEN TOR. ew/'5 #0n/and ATTORNEY L. G. ROWAND. v

lNCLINED SCREEN.

APPLICATION .FILED MAR. 23. 19m.

,294,309. Patented Feb.11,1919.

3 SHEETS-SHEEI 2.

6.9 Egg,

l0 40 INI" f a:

Figi Q L. G. ROWAND.

INCLINED SCREEN.

APPLICATION FILED MAR. 23, 191s.

l ,294, 309 I, Patented Feb. l1, 1919.

[NI/EN TOR. fw/5 6. /fnwawd ATTORNEYS.

mr norms rum: co4 momuma., msumcmu, nv r iran srarns 'PATENT orme LEWISG, ROWAND, OF BROOKLYN, NEW YORK, ASSIGN OR 'IO THE'NEW JERSEY ZINCCOMPANY, OF NEW YORK, N. Y., A CORPORATION 0F NEW JERSEY.

INCLINED SCREEN.

Specification of Letters Patent.

Patented Feb. 11, 1919.

To @ZZ whom it may concern.'

Be it known that I, LEWIS G. RowAND, a citizen of the United States,residing at Sea Gate, borough of Brooklyn, in the county of Kings, cityand State of New York, have invented certain new and useful Improvementsin Inclined Screens; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The present invention relates to improvements in inclined screensespecially adapted for the screening of ores. Inclined screens forthispurpose have heretofore been constructed of al number of separatescreen sections fixed upon an inclined frame, and having screeningsurfaces of suitable mesh to cause successive removal of particles ofincreasing size as the ore falls over the sections. The screens areplaced within an inclosed chamber provided with pockets to receive thescreenings, and doors are provided in order to permit access to thechamber. Since the screens are of considerable height, the doors carrysteps or stair rounds upon which an operator may ascend to clean out anyof the screen sections which may have become clogged in service, andalso to reach the gateway for controlling the supply of ore to theapparatus, this gateway being located at the upper end of the apparatus.

Apparatus of the type referred to above possesses certain disadvantages,inasmuch as the screen sections are fixed in place so that it is a.somewhat diiiicult matter to properly clean them, as the particlesbecome wedged in the meshes of the screens and thev operator cannotreach the under surface of the screen to brush out these wedgedparticles. Furthermore, since the supply gateway is located at the topof the apparatus, it is necessary for the operator to ascend ktheapparatus every time he wishes to stop or start the flow of ore, or tochange the size of the supply opening. In practice, it is frequentlydesirable to change the inclination of the screening surfaces, lbut inapparatus as usually constructed, the screening surfaces are fixed inplace so that they cannot be altered without a considerablereorganization of the apparatus.

Thepresent invention seeks to overcome he disadvantages of priorapparatus of the general type described above by providing an inclinedscreen, especially adapted for the screening of ores, in which eachscreen section is adjustably mounted so that the angle of inclination ofthe screening surface may be altered within certain limits,y and inwhich this screening surface is hinged to the frame of the section, sothat it may be tipped to permit it to be cleaned from both sides.Another improvement in the appz.- ratus of the present inventionconsists in connecting the gateway for controlling the supply of ore tothe screens to an operating` rod extending the entire length of theapparatus, and serving in addition as a hand rail for use by an operatorin ascending or descending over the screen. The operating rod isprovided at intervals with handles by which it may be manipulated by anoperator to control the gateway from any point of the apparatus, thusresulting in a material saving of the operators time over the formerapparatus in which the operator is obliged to ascend to the top everytime he wishes to manipulate the gateway. The mechanism for operatingthe gateway is also provided with devices by means of which the size oft-he ore discharge opening may be regulated.

Other objects and advantages of the present invention will appear moreclearly 'from a description of a preferred embodiment thereof asillustrated in the accompanying drawings in which Figure l is a sideelevation principally in section; Fig. 2 is a plan view with parts insection along the line 2-2 of Fig. l; Fig. 3 is an enlarged view of akportion of Figfl; Fig. i isa transverse sectionalong the line 4 4 ofFig. 3; Fig. 5 is a transverse section along the line of Fig. l and Fig.6 is a transverse section through the ore supply hopper along the line 66 of Fig. l.

Referring to the drawings in which similar reference characters denotesimilar parts throughout the several views, the frame of the apparatusis composed of side members or girders l0 set at the proper inclination,which in the embodiment here shown is approximately to the horizontal.At their lower ends, the'girders are fastened between angle bars 1lforming the base of the apparatus and connected to other angle bars 12attached to t-he floor. Between the angle bars 1l is a divider 13 whichserves to brace these bars and to Separate the base of the llO j upperend lof the apparatus is a transverse frame 17 which serves as a supportfor the feed hopper 18 into which the, ore is supplied in any convenientmanner. The lower end of the feed hopper is closed by a gate 19 pivotedas kshown most clearly in Fig. 6 to lugs 20 projecting from. the wall ofthe hopper.y A rod 21 has one end connected to the gate, and its otherend is connected toV an arm 22 mounted on theupper end of an operatingrod 23, which passes through a bearing in a T 24 attached to the outerend of a post'25 set in a floor flange 26 mounted upon a cross bar 27,which extends across the frontofV the apparatus and is attached to thegirders 10 byangle irons 28. The lower end of the operating rod 23passes through a bearing member 29 on the end of another post 25 similarto, and attached in the same manner as the post at the top of theapparatus. In, order to take up the weight of the operating rod 23, aspring` 30 surrounds the lower end of the rod between the upper `face ofthe .bearing member 29 and a collar 31 which may be adjustably attachedto the rod 23. A number of operating handles 32 are attached tothe rod23,

and these handles should preferably be arranged so that they may beadjusted longitudinally of the rod to bring vthem into position wherethey may be conveniently reached by an operator from various points ofthe apparatus. ln connection with the above described mechanism foroperating the gate 19, there is provided in the T 24a fixed stop 33,andan adjustable stop 34 in the forni of a plate having a slot throughwhichr passes a-clamping bolt 35 threaded into the The arm 22 isprovided with a reduced end as at 36 adapted to engage either of thestops 330i" 34 to limit ythe movement of the arm and consequently theextent of opening Vof the gateway.

rlhe ore screeningV devices of the apparatus comprises a pluralitly ofpockets and screen sections arranged between tliegirders 10, and oftherequisite number necessary to produce the desired successive screeningof the ore during its passage through'the apparatus. The upper pocket 40which lies just below the discharge end of the feed hopper 18 has Vendportions 41 attached to the girders 10 by bolts, and a transverse shelfportion 42 to which is attached a wearing plate 43, which is constructedof hard steel and is provided with slots through which pass bolts 44 bymeans of which the position of the wearing plate upon the shelf of thepocket may be adjusted. Each of the other pockets 45 has side portionsby Y which it is attached to the girders 10,-andy has a rear shelf 46similar to the shelf of the pocket 40, and having attached thereto asteel wearing plate 47. These pockets are also provided with frontshelvesY 48 to A which steel wearing plates 49 similar to the wearingplates 47 are adjust-ably attached.

Each of the screen sections 0f the apparatus comprises a screen 50,preferably'formed cfa metal plate perforated with narrowy slots of a.width suitable to permit the passage of ore particles ofv a certainsize', the

`screens having the narrowest slots being atl the top 'of the apparatus.Each screen (plate is mounted in a rectangular frame 51,

and each frame is attached at its lower end by hinges 52 to a support53. The supports are bolted to inclined members 54 extending between theends of the pockets-45, and preferably formedas continuations of therear shelves 46 of these pockets. Slots are provided `in either or boththe Vmembers y54V andthe supports 53 to permit the yangle of inclinationof. thescreen frames to be altered within cert-ain limits.v When thescreen frames are in normal position, their upper Y ends rest on ledges'formed by projections 55 A at the bottom of the rear shelves ofthepockets. llVhen in lopen position the ends of the frames rest upon/thecross bars 27 at Vthe front of thev apparatus.y While the screenfra-nies extend substantially from kone girder to the other, there maybe narrow spaces at their ends through which .unscreened ore might fall.1n ordervt-o fill these spaces, wooden strips` 56placed on and attachedto the girders 10 areV provided. V.At their upper ends, these strips arefitted 'bee neath the rear shelves 46 of the pockets,-and` at theirlower ends they fit against the memf bers 54. or closely adjacentthe'supports 53 in case the latter extend completely to the girders- Thelowermost rscreen frame has its support 53 adjustably attached to Vtheinclinedl face 57 of a triangular bracket 58 which'is Vattached to thebasevfrranie ofthe apparatus.

For the purpose of collecting the particlesk of ore after theyhave'passed through the screens, there is provided a'series of ypocketsformed by means of liners 60 which are bolted to the girdei's 10 and areprovidedY with outwardly extending lugs 61 forming.

slots withinwhich are inserted transverse choke bars 62 formingthebottom of each of the pockets. screenings of one size should preferablybe provided with a chute 63 through which The pockets. which ,receivethese screenings may be discharged, and there should be as many of thesechutes as there are screens of different mesh, excepting at the bottomof the apparatus where the last screenings fall into one of the hoppers14. At the points where the chutes are led off, the choke bars should beextended as indicated at 62 in Fig. l, in order to prevent anyscreenings from falling into lower pockets.

As has been previously stated, the posts 25 are mounted upon transversemembers 27 which are attached to the girders 10 by angle irons 28,but inaddition to the transverse members to which the posts are att-achedthere are a number of others throughout the length of the apparatus.These transverse members serve as supports to which the covers of theapparatus are attached, and also serve as abutments for the lower endsof the covers, as well as for the screen frames when the latter are inopen position. Each of the covers comprises a frame work 65 hinged as at66 to one of the transverse members 27, and having its lower end formedto rest upon the upper edge of the next lowest member 27. Each cover isprovided with brackets 67 and between these brackets are rounds 68 whichform steps. Pivoted to each cover are latches 68', which as shown mostclearly in F ig. 3 are adapted to fit over the stair rounds of the coverimmediately above to hold the cover open. At the top of the apparatus isa hinged cover 69 which when turned into the dotted line positionpermits access to the gate mechanism associated with the feed hopper.This cover is provided with a staple or hook 70 to which the latch ofthe upper door may be attached.

In the operation of the apparatus described above the lore is suppliedto the feed hopper 18, and when the gate 19 is opened the orefdrops intothe upper pocket 40 and when a `pile of ore has accumulated on shelf 42-it falls over the edge of the wearingplate of this pocket and dropsonto the screening surface. Particles of a size to pass through thisscreen will fall into the receiving pocketsat the rear of the apparatus,while the over size particles will fall upon the front shelf 48 of thepocket 45 and when sufficient material has accumulated on this shelf, itwill fall off over the wearing plate 49 onto t ie rear shelf of the samepocket and from the lat-ter, it will pass over the wearing plate 47yonto the screening surface immediately below. After the pockets becomefilled the ore will fall upon ore and thus have less tendency to abradethe metal of which the pockets are formed. The wearing platesI being ofhard steel are not so readily abraded iby the; ore falling over them. lnthe preferred embodiment, this screening surface is supposed to be ofthe same mesh as the first one, and thus will screen out particles whichfailed to go through the lil-st screen. These particles will fall intothe receiving pockets and as the latter become sufciently filled, thematerial will flow over the choke bars, and finally pass into the chu-te68. The ore will continue its course throughout the entire length of theapparatus, particles yof gradually increasing size being successivelyremoved and finally the particles that are too large to pass through anyof the screens will fall onto the horizontal portion of the bracket 58,and pass over the edge of the latter into the forward hopper 14. Theparticles of largest size which pass through the lowermost screens willbe collected in the pockets at the bottom of the apparatus and flow overthe choke bars into the rear hopper 14.

In apparatus of this character, it is necessary to clean the screeningsurfaces at intervals, and in order to do this in the present case, theoperator ascends to the screen sections to be cleaned, and afterstopping the feed of ore, lifts the cover of the section to be cleaned,and swings the screen into its onen position. By means of suitablebrushes or cleaning implements, he may then clean both sides of thescreen, so that any particles which have become wedged in the meshes ofthe screen will be dislodged by one or the other of the cleaningoperations. if at any time, while the operator is upon the apparatus hedesires to start or stop the flow of ore therethrough, he may manipulatethe gate 19 by rotating the rod 23 by means of the nearest handle 82. Atthe same time, he

may use the rod 23 for a. hand rail while traveling' over the apparatus.By means of the adjustable stop 34 on the T 24 on the upper end of theapparatus, the size of the ore feed opening may be altered to suit theparticular ore that is being screened and after the stop khas been setfor an opening `of a certain size, the same size of opening will'alwaysbe presented whenever the gate is manipulated. The inclination of thescreening surfaces may be altered within certain limits, preferablybetween 350 and 45o to the horizontal, by means o-f the bolt and slotconnections of the supports 53, and the operator may effect thisadjustment by reaching through the doorways on the front of theapparatus.

With the apparatus described above, the screening surfaces may bethoroughly cleaned, they may also be set at the proper inclination forproducing the most effective screening, and ore may be supplied at therate adapted for; best results. A considerable saving of the operatorstime may be effected by the provision of the operating rod, which may bemanipulated from any part of the apparatus to control the operation ofthe gate, and in fact, the gate may even be manipulated from the groundby providinga handle 32 which may be reached by an operator at `the baseof the apparatus.

I claim: 1. 'In ore lscreening apparatus provided with an inclined frameand ore pockets mounted on the frame, the combination of a pluralityofinclined screens between the pockets, each of said screensbeingpivotedV at one end toa pocket and supported at the other end uponan adjacent pocket.

2. In ore screening apparatus provided with an inclined frame and orepockets mounted on the frame, the combination of a plurality of inclinedscreens between the pockets, each of said screens being pivotedy at itslower end to the top of a pocket-and having its upper end supported uponthe Ibottom of an adjacent pocket. Y Y

3. In Vore screening apparatus provided with an inclined frame and orepockets mounted on the frame, the combination of supports adjustablyattached to the upper ends of the pockets, and inclined screens eachhaving one end pivoted to one of said supports and the other end restingupon thebottom of an adjacent pocket.

4:. In yore screening apparatus provided with an inclined frame and orepockets mounted on the frame, the combination of supports adjustablyattached tothe upper ends of the pockets, and inclined screens eachhaving its lower end pivoted to one of said supports and its upper endresting upon the bottom of an adj aceiit pocket;

5. In ore screening apparatus kprovided with an inclined frame and orepockets mounted on the frame, the combination of supports adjustablyattached to the upper ends of they pockets, inclined screen frames,

each having one end pivoted to one of said supports and the other endresting upon the bottom of an adjacent pocket, and al screen surfaceVmounted on each 'of the frames.

6. In ore screening apparat-us provided with a frame consisting ofinclined spaced members and pockets mounted between the members, thecombination of a plurality of inclined screens between the pockets, eachof said screens being pivoted at one end to a pocket and supported atthe other end, when iny operative position, upony an adjacentv tweentliefranie members at the forward' edges thereof and upon which saidscreens,` may rest when swung intol position to be cleaned, and doorspivoted to said transverse supports and resting upon the forward-n'edges of the inclined members, through which access may be obtained tothe screens. 8. In ore screening apparatus providedwith an inclinedframe, having at its upper end an ore-feed hopper provided'r with agate, theV combination of an operatingrod rotatably mountedupon theVframe and eX# tending from top to bottom thereof, handles r-.djustablvmounted upon the rod, andan y operating connection betweenthe rod andthe gate.

In ore screening apparatus/provided with an inclined frame having at itsupper y end an ore-feed hopper provided with a gate, the. combination ofmeans whereby said gate may be operated from any part yof the apparatus,said meansv comprising an operating` rod rotatably mounted upon theframe in substantially parallel relation thereto, and an operatingconnection between the rod and the gate. Y

l0. In ore screeningappai'atus provided with an inclined frame having atits upper end an ore-feed hopper provided with a gate,` the combinationof posts mounted upon the forward edge of the frame, a rod lmounte'd insaid posts, aV spring support for the lowerV end of the rod, an armattached to the upper end of the rod, connection between the arm and theOfate, and actuating handles adjustably vmounted on the rod. i

l1. In ore screening` apparatus provided with an inclined frame. havingat its upper end an ore-feed hopper provided vwithvf a Y gate, thecombination of posts mountedl upon the forward edge of the frame,a rodrotatably mounted in said posts inconvenient position to be used as' ahand-rail, handles adj ustably mounted on the rod and by means Y ofwhich the rod may be'rotated,an arm attached to the upper end of the rodand a connection between the arm and the gate.

l2. VIn ore screening apparatus provided with an inclined frame havingat its upper end an ore-feed hopper provided with a gate,

the combination of posts mounted upon lthe forward edge of the frame,bearingsupon the outer ends of the posts, a'rod rotatablyY mounted inthe bearings, an arm attached to the upper end of thierrod, stopsmounted on the bearing of the topmost post for limiting 'Y the moving ofthe arm, a connection between the arm and the gate, and Voperatinghandles adjustably mounted on the rod.

13. In ore screening apparatus provided with an inclined frame having atits lupper end an ore-feed hopper provided with a gate., thecombination'of posts mounted 'upon the forward edge of the frame,bearing members upon the outer ends of the posts, a rod,

rotatably mounted in the bearing members, an arm attached to the upperend of the rod, a fixed stop and an adjustable stop mounted upon thebearing member of the topmost post and adapted to be engaged by one endof the arm to limit movement thereof, a connection between the other endof the arm and the gate and operating handles adjustably mounted on therod.

14, In ore screening apparatus provided with an inclined frame havingore pockets mounted therein and an ore feed hopper at the upper end ofthe frame provided with a gate for controlling the feed of ore to theapparatus, the combination of inclined screens each having one endpivoted to a pocket and the other end resting upon an adjacent pocket,bars attached to the front of the frame upon which the screens may restwhen swung from normal position, said bars also forming steps along thefront of the frame, and means whereby an operator may control the gatefrom the vicinity of any of the screens, said means comprising a rodextending along the frame, an arm on theupperend Iof the rod and aconnect-ion between the arm and the gate, said rod also serving as ahand-rail for an operator when upon the steps.

l5. In ore screening apparatus provided with an inclined frame havingsteps along the front face, ore pockets molmted within the frame, and anore feed hopper and gate at the upper end of the frame, the combinationof a plurality of inclined screens each of which is pivotally attachedto a pocket so that it may be swung forwardly and supported upon a stepin position to be cleaned by an operator upon the steps, and meanswhereby the operator may at the saine time control the feed of ore tothe pockets and screens, said means comprising a rod extending along theframe, adjustable operating handles upon the rod and a connectionbetween the rod and the gate.

in testimony whereof I aiiix my signature.

iinwis e. RowAND.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

